Coupler Chain Mount The Coupler Chain Mount is CNC machined from 6061T-6 aluminum and attaches with two stainless steel 3/8? x 1.5? ball detent pins through the Coupler Chain Mount and the hollow chain link pins to secure an attached Mega-Coupler anywhere along the length of the chain. The Mega-Coupler then provides a secure connection for a cross pipe or vertical pipe for hanging lighting or other loads. By using two vertically spaced Chain Pole Clamps each with the Coupler Chain Mounts, multiple 12 foot long pipes could be very securely positioned for lighting or other purposes.